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About rtl

I was smiling reading your answer, Doris ... I realize how absurd my question was, but to you it should show how novice I am when it comes to communicating in Forms ... the wheel made noise and I freaked ... since then I kept working and after 10 minutes it stops 'shirking'.
Thanks for your all immediate responses ...

I was given an old hand built gas kiln that was used for glass.
It is 26 x 27 x 33"
I replaced the four burners to venturi burners
It is run on natural gas
The damper is 9 x 5"
It reaches 1,900 degrees in 5 hours or so, but then temp climbs average of 60 degrees
I tried four times with slight variations of end temp, left the firing 2 times for 14 hours, but
I was never able to reach cone 6.
Any suggestions? I noticed the walls are fire bricks but only one layer, could it be that I'm
loosing too much heat?

It's an old kiln. 26" x 27" depth x 37 hight
Flat top with one brick rise to flue: 5" x 9"
It use to have an opening of 11 x 15" and I closed it w/firebrick to 5 x 9"
4 Venturi burners.
After 7 hours it reached 1250 F. degrees, and was climbing then very slowly
that I ended up shutting it down.
First time flue was almost closed
2nd time I left the flue wide open.
What should I do? I would like to fire to cone 6
Thanks for your help,
Ruty

where should I put peepholes on gas kiln? Bottom, middle or top?
It has 4 burners and is about 27"x28x26
Does it matter that the thermocouple is inserted towards the top
of the kiln? should I bring it down?
I'm looking to convert this hand built old glass kiln to cone 6 ceramic firing.

where should I put peepholes on gas kiln? Bottom, middle or top?
It has 4 burners and is about 27"x28x26
Does it matter that the thermocouple is inserted towards the top
of the kiln? should I bring it down?
I'm looking to convert this hand built old glass kiln to cone 6 ceramic firing.